Van Der Waals constant "a" depends on the intermolecular forces among gas molecules. Comparing the following gases, which one will have the highest value for "a"?
Everyday Science / Branch of Science — Multiple-choice practice
- A. He
- B. H₂
- C. N₂
- D. CH₄
Correct answer
CH₄
Explanation
Explanation The Van der Waals constant "a" represents the magnitude of intermolecular attractions. A higher "a" value means stronger intermolecular forces. - He and H₂ are very light, nonpolar, and have weak intermolecular forces. - N₂ is also nonpolar but heavier than He and H₂. - CH₄ (Methane) is nonpolar but larger and more polarizable, so it has stronger London dispersion forces. → Therefore, CH₄ has the highest "a" value among the given options.
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